Methylene dioxy benzene derivatives as synergists for carbaryl

ABSTRACT

A COMPOSITION OF MATTER IS DESCRIBED HEREIN WHICH IS USED AS A SYNERGIST FOR CARBAMATE INSECTICIDES AND METHODS OF USE. THE COMPOSITION MAY BE DEFINE BY THE FOLLOWING GENERIC FORMULA   5-(HC*C-CH(-O-R)-)-1,3-BENZODIOXOLE   WHEREIN R CAN BE SELECTED FROM RADICALS CONSISTING OF N-LOWER ALKYL CARBAMOYL, N-PHENYL CARBAMOYL, N-HALOGENATED PHENYL CARBAMOYL, BENZOYL, ACETYL, PYRANYL AND MIXTURES THEREOF.

United States Patent Int. Cl. A01n 9/28 US. Cl. 424-282 14 Claims ABSTRACT OF THE DISCLOSURE A composition of matter is described herein which is used as a synergist for carbamate insecticides and methods of use. The composition may be defined by the following generic formula wherein R can be selected from radicals consisting of N-lower alkyl carbamoyl, N-phenyl carbamoyl, N-halogenated phenyl carbamoyl, benzoyl, acetyl, pyranyl and mixtures thereof.

BACKGROUND OF THE INVENTION Among the many insecticidal compounds, the carbamates have reached a relatively high degree of commercial success. The carbamates are immediately toxic to a large number of insect pests at different concentrations varying with the resistance of the insects mentioned. Some of these compounds are described and claimed in US. Pat. 2,903,478 and sold under the trade name SEVIN.

The endeavor to extend the usefulness of the carbamates by increasing their effectiveness and lowering their cost has led to extensive studies on another class of insecticidal material, customarily referred to as synergists. Among the many synergists employed, the alkyl oxides, specifically, piperonyl butoxide, have been widely used. These compounds are described in US. Pat. Nos. 2,485,681 and 2,550,737.

While these compositions enhance the usefulness of the carbamates, they do not measure up to the low cost that is desirable along with increased eifectiveness.

CROSS REFERENCE TO RELATED APPLICATION This application is a continuation-in-part of our copending application Ser. No. 884,685 filed Dec. 12, 1969, entitled Synergists now abandoned.

BRIEF DESCRIPTION OF THE INVENTION It has been discovered that the carbamate compositions having insecticidal activity can be greatly increased by using a synergist, therefore, having the following formula:

in which R is a radical selected from the group consisting of N-lower alkyl carbamoyl, N-phenyl carbamoyl, N- halogenated phenyl carbamoyl, benzoyl, acetyl and pyranyl. The term lower alkyl is defined as an alkyl group having from 1-6 carbon atoms. The term halogenated includes chlorine, bromine, iodine and fluorine.

Patented Mar. 5, 1974 "ice In the practice of the present invention, the synergistic compounds of the present invention are manufactured by reacting l-propyne alcohol substituted at the 3rd position with certain vinyl ethers, acid chlorides orisocyanates. After the end products are achieved, they are isolated and purified and admixed with the insecticidal compositions. The amount of synergist admixed therewith can range from between about 1 to 0.1 to about 1 to 10 parts carbamates to synergist composition. After the carbamates and synergists are mixed together, they are applied to a habitat in a conventional manner as indicated for use with the carbamates.

In order to illustrate the merits of the present invention, the following examples are provided:

EXAMPLE 1 H2O (IJECH o -oH-oiNH-on, 0

21 grams (0.12 moles) of 3 (3', '-methylenedioxyphenyl)propyne-3-ol was dissolved in ml. of acetone containing about 0.1 gram of triethylene diamine and 0.1 g. of dibutyl tin dilaurate. Then, 8.5 g. of methyl isocyanate was added. The mixture was heated at reflux temperature for two hours, cooled and the actone removed by evaporation under vacuum to give 27.5 g. of a solid product having a M.P. of between 75.5 and 77 C.

EXAMPLE 2 EXAMPLE 3 CECH O A mixture was formed containing 5.9 grams of 3-(3,4'- methylenedioxyphenyl)-propyne-3-ol (0.033 M), 50 ml. of ether, 4.0 g. of phenyl isocyanate and 1 drop of dibutyl tin dilaurate. The reaction went to completion slightly exothermically (to about 25 C.). The mixture was allowed to stand overnight, wherein a small amount of solid was filtered oif and discarded. The filtrate was concentrated in a vacuum to yield 15.6 g. of an oil. n 1.5687.

EXAMPLE 4 CECE O To the mixture of 3-(3',4'-methylenedioxyphenyl)propyne-3-ol (0.033 M), 50 ml. of ether and 4.7 g. of benz'oyl chloride was added 4.7 ml. of triethylamine over a period of 5 minutes with slight cooling. The resulting mixture was allowed to stand overnight and the mixture was then 3 washed with water. The ether solution was dried over magnesium sulfate and evaporated in vacuum to yield 7.1 g. of an oil. 11 1.5793.

EXAMPLE The procedure involved in Example 4 was repeated in its entirety, except 2.50 ml. of acetyl chloride was used in place of the benzoyl chloride. 7.2 g. of an oil was the yield. 11 1.5420.

EXAMPLE 6 INSECTICIDAL EVALUATION I. House fly [Musca domestica (L.)]

The following procedure was used to test houseflies. A stock solution containing 100 g/ml. of the toxicant in an appropriate solvent was prepared. Aliquots of this solution were combined with 1 milliliter of an acetonepeanut oil solution in a glass Petri dish and allowed to dry. The aliquots were there to achieve desired toxicant concentration ranging from 100 ,ug. per Petri dish to that at which 50% mortality was attained. The Petri dishes were placed in a circular cardboard cage, closed on the bottom with cellophane and covered on top with cloth netting. Twenty-five female houseflies were introduced into the cage and the percent mortality was recorded after 48 hours. The LD values are expressed in terms of g. per 25 female houseflies. The results of these insecticidal evaluation tests are given in Table I.

II. German cockroach [Blattella germam'ca (Linn)] Ten one-month-old nymphs are placed into a circular cardboard cage sealed on one end with cellophane and covered by cloth netting on the other. Aliquots of the toxicant, dissolved in acetone, were applied to the abdomen by means of a microsyringe. Test concentrations range from micrograms per roach to that at which 50% mortality is obtained. Percent mortality is recorded after 72 hours and the LD values are expressed in micrograms per roach in Table II.

III. Black bean aphid [Aphis fabae (Scop.)]

Nasturtium (Tropaeolum sp.) plants, approximately 2-3 inches tall, are transplanted into sandy loam soil in 3 inch clay pots and infested with 59-75 aphids of mixed ages. Twenty-four hours later they are sprayed, to the point of runofi, with aqueous suspensions of the toxicant. Aliquots of the toxicant, dissolved in an appropriate solvent, are diluted in water to which has been added 0.0002% of a conventional wetting agent such as polyoxyethylene sorbitan monolaurate ether of alkylated phenols blended with organic sulfonate. Test concentrations ranged from 0.05% to that at which 50% mortality is obtained. Mortality is recorded after 48 hours and the LD values are expressed as percent active ingredient in the aqueous suspensions in Table III.

TABLE I [Average LDu values, g. 125 female houseflies] Carbaryh plus- 1 Sold under trade name Sevin.

TABLE 11 [Average LDso values, [lg-[$08011] Oarbaryl 1 plus coded Coded compound, compound carbaryl 1:5 ratio Example:

1 Sold under trade name Sevin.

TABLE III [Average LDso values, black bean aphid] Carbaryl 1 plus coded Coded compound, compound carbaryl, 1:5 ratio percent Example:

I 0. 0008 0.0002 III 0. 0008 0. 0002 1 Sold under trade name Sevin.

What is claimed is:

1. An insecticidal composition comprising an insecticidal amount of carbaryl and as a synergist therefor a synergistic amount of a compound having the formula wherein R is a radical selected from the group consisting of N-methyl carbamoyl, N-phenyl carbamoyl, N-p-chlorophenyl carbamoyl, benzoyl, acetyl and pyranyl, and wherein the ratio of carbaryl to synergist is 1 to 5.

2. An insecticidal composition as set forth in claim 1 wherein R is N-methyl carbamoyl.

3. An insecticidal composition as set forth in claim 1 wherein R is N-phenyl carbamoyl.

4. An insecticidal composition as set forth in claim 1 wherein R is N-p-chlorophenyl carbamoyl.

5. An insecticidal composition as set forth in claim 1 wherein R is benzoyl.

6. An insecticidal composition as set forth in claim 1 wherein R is acetyl.

7. An insecticidal composition as set forth in claim 1 wherein R is pyranyl.

8. The method of killing insects comprising applying to the habitat of said insects an insecticidally effective amount of the composition of claim 1.

9. The method of killing insects comprising applying to the habitat of said insects an insecticidally effective amount of the composition of claim 2.

10. The method of killing insects comprising applying to thehabitat of said insects an insecticidally effective amount of the composition of claim 3.

5 6 11. The method of killing comprising applying to the Ref nce Cited habitat of said insects an insecticidally effective amount of the composition of claim 4. UNITED STATES PATENTS 12. The method of killing insects comprising applying 2,904,465 9/1959 Morefield 424-482 to the habitat of said insects an insecticidally efifective 2,951,850 9/1960 HarPle et a1 424-282 5 3,423,428 1/ 1969 Fellig et a1 424-282 amount of the composition of claim 5.

13. The method of killing insects comprising applying to the habitat of said insects an insecticidally effective ALBERT Primary {Exammer amount of the composition of claim 6. TURNER, Assistant ner 14. The method of killing insects comprising applying to the habitat of said insects an insecticidally effective 10 amount of the composition of claim 7. 260-3405; 424-283 

